Daniele Rondoni

Case by CDT Daniele Rondoni

When planning to replace Class II restorations, many things need to be considered. In order to select the most appropriate restorative technique and preparation design, it is essential to evaluate the amount and state of the remaining tooth structure, first. After repeated restoration replacement or in teeth originally restored with amalgam, for example, the remaining walls and cusps are often weakened and prone to fractures and cracks. When the cavity walls appear to be too thin or the structure is weak at the time of restoration replacement, it may be better to remove walls and cusps and opt for indirect adhesive restorations (overlays) instead of direct composite restorations. Due to favourable material properties – in particular a high flexural and compressive strength while being gentle to the opposing dentition and not too rigid for the surrounding tooth structures – we often opt adhesive restorations made of KATANA™ AVENCIA™ Block in those situations.

The following clinical case is used to describe the replacement of two composite restorations with overlays made of the innovative hybrid ceramic material.

Fig. 1. Initial clinical situation with composite restorations on the second premolar and first molar in need of replacement. The tooth structure particularly of the first molar was weak, with the distobuccal cusp already fractured.

Fig. 2. Prepared tooth structure ...

Fig. 3. Restorations milled from a KATANA™ AVENCIA™ Block after high-gloss polishing and characterization.

Fig. 4. Finalized restorations on a resin model.

Fig. 5. Adhesively cemented restorations in the patient’s mouth.

FINAL SITUATION

Fig. 6. Treatment outcome with a nice transition from the tooth structure to the restoration.

Case by MDT Daniele Rondoni

Tavaliselt saab hambaravis kasutatava keraamilise materjali esteetilisi omadusi – eriti selle läbikumavust – suurendada vaid paindetugevuse arvelt. Kuraray uus KATANA™ Zirconia YML Noritake Dental Inc. on teistsugune. Selle kõrge painduvusega tooriku alumises pooles on tugevus 1100 MPa ja kõrge poolläbipaistvus ülaosas ja hambumuse piirkondades annab sellele suure esteetilise potentsiaali ja piiramatu näidustusvahemiku, nagu näiteks järgmise juhtumi korral.

Joonis 1. KATANA™ Zirconia YML 4-osaline ja 6-osaline sild pärast freesimist ja kuumkõvastamist. Esteetiliste monoliitsete restauratsioonide valmistamisel on loomuliku vestibulaarse pinnatekstuuri loomine otsustava kaaluga.

Joonis 2. Kahel mudelil silla eestvaade pärast seda, kui neid on mikrokihitatud tooniga CERABIEN™ ZR FC Paste Stain (Kuraray Noritake Dental Inc.).

Joonis 3. Toonitud ja glasuuritud restauratsioonid ja nende läbikumavus valguse käes.

Joonis 4. Patsiendi suhu tsementeeritud 6-osalise silla bukaalne vaade.

Joonis 5. Patsiendi suhu tsementeeritud 6-osalise silla bukaalne vaade.

Selle uut tüüpi mitmekihilise tsirkooniumiga on võimalik luua esteetilisi monoliitseid restauratsioone, mis sobivad kasutamiseks ka esihammaste piirkonnas. Hoolimata tugevuse järgjärgulisest vähenemisest saab seda kujundada väga mitmekesiselt ning lõikepindade suur läbikumavus annab pärast kuumkõvastamist loomuliku ilme. Monoliitse pinna mikrokihitamisest ja glasuurimisest piisab, et tagada patsienti rahuldavad tulemused.

DANIELE RONDONI, MDT

By Daniele Rondoni, RDT

Considering different criteria to select the ideal zirconia and frame design to meet the level of esthetics requested.

Step 1
Final Preparations.

Step 2
Zirconia Frame (KATANA Zirconia STML A2) cut-back designed to reproduce translucent incisal area.

Step 3
Application of 1st Internal Stain and firing.

Step 4
Application of 1st Luster, Clear Cervical and firing.

Step 5
Application of 2nd Internal Stain and firing.

Step 6
Application of 2nd Luster, and Opacious Body.

Step 7
Completion of firing.

Step 8
Completion of morphological correction.

Step 9
Post-operative view.

By Daniele Rondoni, RDT

Preoperative view

1 PFM. 3 Laminates on refractory

Postoperative view

NORITAKE SUPER PORCELAIN EX-3 CHROMATIC MAP